ISO 735:1977
(Main)Oilseed residues - Determination of ash insoluble in hydrochloric acid
Oilseed residues - Determination of ash insoluble in hydrochloric acid
The method consists in treating of the total ash (see ISO 749) with hydrochloric acid, to remove the portion soluble in this reagent, then incinerating and weighing of the residue and replaces ISO Recommendation R 735-1968.
Tourteaux de graines oléagineuses — Détermination des cendres insolubles dans l'acide chlorhydrique
General Information
- Status
- Published
- Publication Date
- 30-Sep-1977
- Technical Committee
- ISO/TC 34/SC 2 - Oleaginous seeds and fruits and oilseed meals
- Drafting Committee
- ISO/TC 34/SC 2 - Oleaginous seeds and fruits and oilseed meals
- Current Stage
- 9093 - International Standard confirmed
- Start Date
- 13-Jun-2024
- Completion Date
- 13-Dec-2025
Overview
ISO 735:1977 specifies a laboratory method for the determination of ash insoluble in hydrochloric acid in oilseed residues. The procedure applies to residues produced by extraction of oil from oilseeds (pressure or solvent extraction), excluding compounded products. The method treats the total ash (see ISO 749) with hydrochloric acid to dissolve acid‑soluble material, then incinerates and weighs the remaining insoluble residue.
Keywords: ISO 735, oilseed residues, ash insoluble in hydrochloric acid, determination, total ash, incineration, HCl.
Key topics and technical requirements
Scope and definition
- Targets the fraction of total ash that remains undissolved after HCl treatment.
- Applies to oilseed cake and meal residues from oil extraction.
Principle
- Treat total ash with hydrochloric acid, remove soluble fraction, incinerate and weigh the insoluble residue.
Reagents and materials
- Hydrochloric acid: 3 N solution.
- Silver nitrate solution for chloride testing.
- Hardened, ash‑free filter paper.
Apparatus
- Analytical balance (readability 0.001 g), muffle furnace (550 ± 15 °C), flat-bottomed incineration dish, desiccator.
Procedure highlights
- Prepare total ash as per ISO 749.
- Moisten ash with HCl, wash and boil; filter and wash until chloride-free (silver nitrate test).
- Carbonize filter + residue, incinerate at 550 ± 15 °C until free of carbon, cool in desiccator and weigh.
- Repeat heating and weighing until successive weighings differ ≤ 0.001 g.
Calculation and reporting
- Result reported as percentage by mass of sample as received; optional conversion to dry‑matter basis using moisture per ISO 771.
- Carry out two simultaneous determinations and report the arithmetic mean if repeatability criteria met.
- Repeatability: difference between two results by same analyst should not exceed 0.2 g ash insoluble in HCl per 100 g sample.
- Report results to one decimal place.
Applications and users
- Quality control in oilseed processing (meal and cake quality).
- Chemical analysis laboratories in food/feed testing.
- Research laboratories studying mineral or silica content of residues.
- Commodity inspection and regulatory testing where ash composition affects grading or utilization (e.g., feed formulation, fertilizer use).
Related standards
- ISO 749 - Oilseed residues - Determination of total ash (method to obtain the total ash input to this procedure).
- ISO 771 - Oilseed residues - Determination of moisture and volatile matter (used for dry‑matter calculations).
This standard is practical for laboratories performing routine compositional analysis of oilseed residues and provides a reproducible, internationally recognized procedure for assessing the acid‑insoluble ash fraction.
ISO 735:1977 - Oilseed residues — Determination of ash insoluble in hydrochloric acid Released:1. 10. 1977
ISO 735:1977 - Tourteaux de graines oléagineuses — Détermination des cendres insolubles dans l'acide chlorhydrique Released:1. 10. 1977
Frequently Asked Questions
ISO 735:1977 is a standard published by the International Organization for Standardization (ISO). Its full title is "Oilseed residues - Determination of ash insoluble in hydrochloric acid". This standard covers: The method consists in treating of the total ash (see ISO 749) with hydrochloric acid, to remove the portion soluble in this reagent, then incinerating and weighing of the residue and replaces ISO Recommendation R 735-1968.
The method consists in treating of the total ash (see ISO 749) with hydrochloric acid, to remove the portion soluble in this reagent, then incinerating and weighing of the residue and replaces ISO Recommendation R 735-1968.
ISO 735:1977 is classified under the following ICS (International Classification for Standards) categories: 67.200.20 - Oilseeds. The ICS classification helps identify the subject area and facilitates finding related standards.
ISO 735:1977 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
INTERNATIONAL STANDARD
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION l MEXAYHAPOJlHAR OPTAHM3AUWfl n0 CTAHAAPTH3ALWi .ORGANISATION INTERNATIONALE DE NORMALISATION
Determination of ash insoluble in
Oilseed residues -
hydrochloric acid
De ’termination des cendres insolubles dans Yacide
Tourteaux de graines ol6agineuses -
chlorh ydrique
First edition - 1977-10-01
UDC 665.117 : 543.868 Ref. No. IS0 735-1977 (E)
Descriptors : oilseeds, oilseed residues, chemical analysis, determination of content, ash, insoluble matter.
Price based on 2 pages
FdREWORD
IS0 (the International Organization for Standardization) is a worldwide federation
of national standards institutes (IS0 member bodies). The work of developing
International Standards is carried out through IS0 technical committees. Every
member body interested in a subject for which a technical committee has been set
up has the right to be represented on that committee. International organizations,
governmental and non-governmental, in liaison with ISO, also take part in the work.
Draft International Standards adopted by the technical committees are circulated
to the member bodies for approval before their acceptance as International
Standards by the IS0 Council.
International Standard IS0735 was developed by Technical Committee ISO/TC 34,
Agricultural food products.
It was submitted directly to the IS0 Council, in accordance with clause 6.12.1 of
the Directives for the technical work of ISO. It cancels and replaces IS0 Recommen-
dation R 735-1968, which had been approved by the member bodies of the follow-
ing countries :
Australia Hungary Portugal
Brazil India
Romania
Bulgaria Iran
South Africa, Rep. of
Israel
Czechoslovakia Thailand
Italy
Chile Turkey
Korea, Rep. of
Colombia United Kingdom
Netherlands
France U.S.S.R.
Germany Poland Yugoslavia
The member body of the following country had expressed disapproval of the
document on technical grou nds :
Canada
0 International Organization for Standardization, 1977 l
Printed in Switzerland
IS0 735-1977 (E)
INTERNATIONAL STANDARD
Determination of ash insoluble in
Oilseed residues -
hydrochloric acid
6.5 Desiccator, containing an efficient desiccant.
1 SCOPE AND FIELD OF APPLICATION
This International Standard specifies a method for the
determination of the ash insoluble in hydrochloric acid,
7 PROCEDURE
from residues (excluding compounded products) obtained
by the extraction of oil from oilseeds by pressure or
Make all weighings to the nearest 0,001 g.
solvent.
7.1 Test portion and incineration
2 REFERENCES
See IS0 749.
I SO 749, Oilseed residues - Determination of total ash.
7.2 Determination
IS0 77 1, Oilseed residues - Determination of moisture
and volatile matter con tent.
Moisten the total ash obtained with 10 ml of the hydro-
chloric acid solution (5.1), covering the incineration dish
containing the ash with a watch-glass. Heat gently and, by
3 DEFINITION
several washes with hydrochloric acid solution (5.1) using
ash insoluble in hydrochloric acid : The fraction of the
about 50 ml of acid solution in all and washing the watch-
total ash which remains undissolved after treatment with glass as well as the dish, transfer the contents of the dish
hydrochloric acid under the operating conditions specified quantitatively to a beaker of about 250 ml capacity. Heat
below.
to boiling and keep gently boiling for about 10 min, then
filter through hardened filter paper (6.3) and wash with
boiling water until chloride ions are removed [test with the
4 PRINCIPLE
silver nitrate solution (5.2)].
Treatment of the total ash with hydrochloric acid,
...
NORME INTERNATIONALE
INTERNATIONAL. ORGANIZATION FOR STANDARDIZATION l MEXJJYHAPOAHAJl OPTAHM3AWïX IlO CTAHAAPTW3AIQWï.ORGANISATION INTERNATIONALE DE NORMALISATION
Tourteaux de graines oléagineuses - Détermination des
cendres insolubles dans l’acide chlorhydrique
Determination of ash insoluble in hydrochloric acid
Oilseed residues -
Première édition - 1977-1 O-01
Réf. no : ISO 735-1977 (F)
CDU 665.117 : 543.868
Descripteurs : oléagineux, tourteau, analyse chimique, dosage, cendre, insoluble.
. .
s
Prix basé sur 2 pages
AVANT-PROPOS
L’ISO (Organisation internationale de normalisation) est une fédération mondiale
d’organismes nationaux de normalisation (comités membres de I’ISO). L’élaboration
des Normes internationales est confiée aux comités techniques de I’ISO. Chaque
comité membre intéressé par une étude a le droit de faire partiedu comité technique
correspondant. Les organisations internationales, gouvernementales et non
gouvernementales, en liaison avec I’ISO, participent également aux travaux.
Les projets de Normes internationales adoptés par les comités techniques sont
soumis aux comités membres pour approbation, avant leur acceptation comme
Normes internationales par le Conseil de I’ISO.
La Norme internationale ISO 735 a été élaborée par le comité technique ISO/TC 34,
Produits agricoles alimen taires.
Elle fut soumise directement au Conseil de I’ISO, conformément au paragraphe
6.12.1 des Directives pour les travaux techniques de I’ISO. Elle annule et remplace
la Recommandation lSO/R 735-1968, qui avait été approuvée par les comités
membres des pays suivants :
Afrique du Sud, Rép. d’ France Portugal
Allemagne Hongrie Roumanie
Australie Inde Royaume-Uni
Brésil Iran Tchécoslovaquie
Bulgarie Israël Thaïlande
Chili Italie Turquie
Colombie Pays-Bas U.R.S.S.
Corée, Rép. de Pologne Yougoslavie
Le comité membre du pays suivant l’avait désapprouvée pour des raisons techni-
ques :
Canada
0 Organisation internationale de normalisation, 1977 l
Imprimé en Suisse
ISO 7351977 (F)
NORME INTERNATIONALE
Tourteaux de graines oléagineuses - Détermination des
cendres insolubles dans l’acide chlorhydrique
6.5 Dessiccateur, contenant un agent déshydratant effi-
1 OBJET ET DOMAINE D’APPLICATION
cace.
La présente Norme internationale spécifie une méthode de
détermination des cendres insolubles dans l’acide chlor-
7 MODE OPÉRATOIRE
hydrique, des tourteaux (à l’exclusion des produits compo-
Faire toutes les pesées à 0,001 g près.
sés) provenant de l’extraction de I’huile des graines oléa-
gineuses par pression ou solvant.
7.1 Prise d’essai et incinération
Voir ISO 749.
2 RÉFÉRENCES
7.2 Détermination
ISO 749, Tourteaux de graines oléagineuses - Détermina-
tion des cendres totales.
Humecter les cendres totales obtenues avec 10 ml de la
solution d’acide chlorhydrique (5.1), en couvrant la capsule
60 77 1, Tourteaux de graines oléagineuses - Détermina-
à incinération contenant les cendres avec un verre de
tion de la teneur en eau et matières volatiles.
montre. Chauffer légèrement et transférer quantitativement
le contenu de la capsule dans un bécher d’environ 250 ml de
capacité, au moyen de plusieurs lavages avec de la solution
3 DÉFINITION
d’acide chlorhydrique (5.1) en utilisant au total environ
50 ml de cette solution et en lavant le verre de montre de
cendres insolubles dans l’acide chlorhydrique : Fraction
même que lacapsule. Chauffer à l’ébullition, maintenir en
des cendres totales restant insoluble après traitement par
ébullition légère durant environ 10 min; filtrer sur papier
l’acide chlorhydrique dans les conditions opératoires spéci-
filtre durci (6.3) et laver à l’eau bouillante jusqu’à élimi-
fiées ci-après.
nation des ions chlorure [contrôlée avec la solution de
nitrate d’argent (5.2)].
4 PRINCIPE
Placer le papier filtre et le résidu dans la capsule à inciné-
ration (6.2) préalablem
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